[题目]What is the first thing you want to do when you see someone yawn? You want to yawn, too! Yawning iscontagious.Scientists have found that all people yawn. Babies start to yawn even before they are 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】

What is the first thing you want to do when you see someone yawn? You want to yawn, too! Yawning iscontagious.

Scientists have found that all people yawn. Babies start to yawn even before they are born. The earliest yawn takes place when a baby is still inside its mother. When young children are about one year old, they start to yawn when they see others yawning. That's why scientists think yawning is contagious.

It’s no secret that yawning is contagious, but why do we yawn? Well, scientists are not really sure.

Some think we yawn because we feel bored. Others believe yawning has something to do with breathing. When there is too much carbon dioxide(CO2) in our bodies, our bodies will tell the brains to breathe deeply. That causes a big yawn.

In 2007, scientists said people yawned to cool down their brains. These scientists found people yawned more often if they were warmer than others.

Scientists are still trying to find out why yawning happens and why it is so contagious. But they are only sure that when one person yawns, immediately everyone else nearby wants to yawn, too.

【1】The underlined word "contagious" in Paragraph 1 means__________.

A. helpful to our health B. passing from one person to another

C. hard to understand D. getting into one trouble after another

【2】According to the scientists, people start to yawn when they are__________.

A. born B. one year old C. 17 or 19 years old D. inside their mothers

【3】Which of the following is NOT RIGHT according to the passage? __________

A. People yawn to catch others' attention. B. People yawn because they are bored.

C. People yawn to cool down their brains. D. People yawn to get rid of carbon dioxide.

【4】We can probably read this passage in a__________.

A. story book B. movie poster C. science magazine D. travel guidebook

【答案】

【1】B

【2】D

【3】A

【4】C

【解析】文章讲述了人们打哈欠的事情。

【1】根据 when you see someone yawn， You want to yawn, too!可知是传染，传递；故选B

【2】根据The earliest yawn takes place when a baby is still inside its mother.故选D

【3】根据Some think we yawn because we feel bored.可知B对；根据scientists said people yawned to cool down their brains. 可知C对；根据Others believe yawning has something to do with breathing. When there is too much carbon dioxide(CO2) in our bodies, our bodies will tell the brains to breathe deeply. That causes a big yawn.可知D对，故选A

【4】根据文章讲述了人们打哈欠的事情。是关于科学的事情；故选C

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Other companies such as Mercedes-Benz, Audi, BMW, Volvo and Toyota are working on self-driving cars. Another company called BestMile is also working on self-driving buses in Switzerland. The buses can hold up to nine people and will be tested for two years.

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【题目】Passage 3

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【题目】阅读理解
Turn left at the second crossing if you drive along Center Street north to south. If you come by bus, you can get off(下车) at the B. Street Bus Station. You can't miss it!
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